user/dev discussion of public-inbox itself
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# Copyright (C) 2020 all contributors <meta@public-inbox.org>
# License: AGPL-3.0+ <https://www.gnu.org/licenses/agpl-3.0.txt>

# Pure-perl class for Linux non-Inline::C users to disable COW for btrfs
package PublicInbox::NDC_PP;
use strict;
use v5.10.1;

sub set_nodatacow ($) {
	my ($fd) = @_;
	return if $^O ne 'linux';
	defined(my $path = readlink("/proc/self/fd/$fd")) or return;
	open my $mh, '<', '/proc/self/mounts' or return;
	for (grep(/ btrfs /, <$mh>)) {
		my (undef, $mnt_path, $type) = split(/ /);
		next if $type ne 'btrfs'; # in case of false-positive from grep

		# weird chars are escaped as octal
		$mnt_path =~ s/\\(0[0-9]{2})/chr(oct($1))/egs;
		$mnt_path .= '/' unless $mnt_path =~ m!/\z!;
		if (index($path, $mnt_path) == 0) {
			# error goes to stderr, but non-fatal for us
			system('chattr', '+C', $path);
			last;
		}
	}
}

1;
debug log:

solving 0d20030d ...
found 0d20030d in public-inbox.git

user/dev discussion of public-inbox itself

This inbox may be cloned and mirrored by anyone:

	git clone --mirror https://public-inbox.org/meta
	git clone --mirror http://czquwvybam4bgbro.onion/meta
	git clone --mirror http://hjrcffqmbrq6wope.onion/meta
	git clone --mirror http://ou63pmih66umazou.onion/meta

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V1 meta meta/ https://public-inbox.org/meta \
		meta@public-inbox.org
	public-inbox-index meta

Example config snippet for mirrors.
Newsgroups are available over NNTP:
	nntp://news.public-inbox.org/inbox.comp.mail.public-inbox.meta
	nntp://7fh6tueqddpjyxjmgtdiueylzoqt6pt7hec3pukyptlmohoowvhde4yd.onion/inbox.comp.mail.public-inbox.meta
	nntp://ie5yzdi7fg72h7s4sdcztq5evakq23rdt33mfyfcddc5u3ndnw24ogqd.onion/inbox.comp.mail.public-inbox.meta
	nntp://4uok3hntl7oi7b4uf4rtfwefqeexfzil2w6kgk2jn5z2f764irre7byd.onion/inbox.comp.mail.public-inbox.meta
	nntp://news.gmane.io/gmane.mail.public-inbox.general
 note: .onion URLs require Tor: https://www.torproject.org/

code repositories for project(s) associated with this inbox:

	https://80x24.org/public-inbox.git

AGPL code for this site: git clone https://public-inbox.org/public-inbox.git